Converting to JConcepts wheels on the Losi XXX-SCT or SCB requires 12mm hex drive adaptors front and rear. With a simple upgrade, utilizing the same wheel front and rear as an interchangeable option is now possible. In addition, XXX-SCT and SCB drivers can now use the JConcepts Hazard wheel which increases the overall width of the vehicle up to 296mm, the ROAR maximum limit.